Brown Ring Patch: A New Disease on Bentgrass Caused by Waitea circinata var. circinata

Plant Disease
Takeshi TodaMitsuro Hyakumachi

Abstract

Isolates of an unidentified Rhizoctonia sp. (NP isolates), obtained from creeping bentgrass (Agrostis stolonifera var. palustris) in Japan that exhibited symptoms of a new disease, were compared with isolates of three varieties of Waitea circinata var. oryzae, var. zeae, and var. circinata. NP isolates also were compared with isolates of R. oryzae obtained from creeping bent-grass exhibiting white patch-like symptoms (RW isolates). The color and size of sclerotia, color of mycelia, and pigment deposition of NP isolates was similar to that of RW isolates and W. circinata var. circinata, but distinctly different from W. circinata var. oryzae and W. circinata var. zeae. The optimal temperature for hyphal growth of NP isolates, RW isolates, and W. circinata var. circinata was 28°C, and for W. circinata var. oryzae and W. circinata var. zeae was 30°C. Pathogenicity tests on creeping bentgrass showed that the severity of disease caused by NP isolates, RW isolates, and W. circinata var. circinata was greater than with W. circinata var. oryzae, but lower than with W. circinata var. zeae. No significant differences in symptom expression were apparent among NP isolates, RW isolates, and W. circinata var. circinata. A phylogenic tree, obt...Continue Reading

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